Type-writing machine.



PATEI TTED DEG. 15, 1903.

L. s. BUBRIDGE. TYPE WRIT-IN G MACHINE.

APPLIUATION FILED AUG. 3, 1901.

rl iL RO MODEL.

J NVENTDR WITNESSES:

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UNITED STATES Patented December 15, 1903.

PATENT OFFICE.

LEE S. BURRIDGE, OF NEW YORK, N. Y., ASSIGNOR TO UNION TYPEWRITER COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE.

srnclrxcn'rron forming part of Letters Patent No. 746,787, dated December 15, 1903.

Application filed August 3,1901. Serial No. 70.771- (No model.) i i To all whom it may concern;

Be it known that I, LEE S. BURRIDGE, acitizen of the United States, and a resident of the borough of Manhattan, city of New York,

in the county of New York and State'of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

My invention relates to carriage-feed mechanisms of the general description shown in the Patent No. 480,306, granted August 9,

1892, to George B. Webb, and wherein there is provided between the carriage-feed mech-' anism and the type mechanism a friction connection for the purposes set forth in said patent; and one of the objects of my invention is to provide simple and efficient mech In the accompanying drawings,Figure l is a fragmentary sectional view of sufiicient number of" parts of a type-writing machine to illustrate my invention, the section being taken from'front to rear of the machine. Fig. 2 is a side view'of a portion of the structure, the

viewillustrating the position of the parts when the .movable feed element is actuated by a key having a comparatively short dip or depression. Fig. 3 is a like viewof the same,

illustrating the position of the parts when the movable feed element is operated by the key having a longer dip or depression. Fig.

i -is a detailed edge view of the portion of the machine to be hereinafter described.

In the drawings, 1 indicates the framing of themachine, in which the key-levers2 are mounted. For the purpose of clearness I have shown only a single key-lever and its cooperating type-carrier 3. Extending beneath the key-levers 2 is a universal bar 4,

which is connected bylinks 5 to a transverse bar supported by a suitable arm 6, which projects from a sleeve loosely carried by the rock-shaft 7 ,and which sleeve likewise carries a crank-arm 8, to which is pivoted a link or movable part 9, the pivot uniting this link to the crank-arm being indicated at 10. The I free end of the link 9 has on one side a pin 11, (see Fig. 4,) and projecting from-its opposite side is apin 12. The pin 12 is connected't-o one end of a coiled contractile spring 13, which at its opposite end is connected to a fixed portion of the machine, as indicated at 14. The pin 11 constitutes a friction -surface which is adapted to bear upon a cooperating segmental friction-surface 15, formed on amovable carriage-feed element 16. This movable feed element 16 is secured to and is movable with the rock-shaft 7, that is freely movable upon its support, and in the present instance is illustrated as a dog-carrier provided with feed-dogs 17 and 18, which cooperate with the carriage-feed rack or wheel 19, operatively connected in any suitable manner to the carriage, the platen of which is diagrammatically illustrated in Fig. 1.

By movable feed element 1 mean the element which has a lateral movement imparted thereto by the keys to eifect the step-by-step feed of the carriage, whether that element be the feed-dogs 17 and 18, as indicated in the present instance, or a laterally-movable rack which cooperates with suitable mechanism to eifect the feed of'the carriage or any other movable feeding device.

The dog-carrier 16 is normally maintained in the position indicated in Fig. l by an expansion-spring 16 which is connected at one end to the dog-carrier and at its opposite end to a suitably-fixed portion of the machine. Suitable means are provided to limit 8 the lateral movement of the dog-carrier, the means illustrated consisting of a set-screw 20, which is adjustable in the dog-carrier and carries an abutment 21, which is adapted to bear against a fixed portion of themachine. The arm 6, which projects from the rock-shaft 7, is likewise provided with a suitable adjustable set-screw, as indicated at 22, to limit the upward movement of the arm 6, and consequently the downward movement of the piv- 95 oted arm 8.

The pin 11, hearing as it does upon the frictional surface 15 of the dog-carrier, will cause the dog-carrier to be moved with it throughout a portion of the stroke against mo the tension of the spring 16 or so long as' the dog-carrier is free to be vibrated in the direction of the arrow in Fig. 1. When, however, the stop 21 abuts against the portion of the machine with which it cooperates, further movement of the dog-carrier in the direction of the arrow will be prevented, and in the event of a further depression ofthe key-lever the pin 11 will be forced forward on the cooperating surface 15 of the dog-carrier, as indicated in Fig. 3 of the drawings.

From the foregoing, description it will be seen that a given predetermined throw is imparted to the dog-carrier or movable feed element irrespective of the extent of the depression of a key. I

Fig. 1 illustrates the normal position of the parts, and Fig. 2 illustrates the position the parts assume when a key having a shortest or comparatively short dip is depressed. It will be observed that in this position the dogcarrier and its actuating mechanism travel together to the limit of their movement. In this position of the parts the stop 21 limits further movement of the dog-carrier. It will be seen, however, that when the parts are in this position the pin 11 is capable of riding forward on the surface 15 against the tension of the spring 13 should the key-lever be further depressed. In Fig. 3 this extreme movement of the parts is shown, it being understood that the view illustrates the position the parts assume when a long dip-key is depressed. When the finger-key is released after the depression thereof, the dog-carrier is restored to the normal position represented in Fig. 1 of the drawings by the spring 16 and the friction between the pin 11 and the part '15 may aid in this restoration of the dog-carrier.

From the foregoing description it will be understood that the finger-keys or type-carrier-actuating mechanism may be depressed to different extents and that the universal bar maypartake of different extents of movement, and yet the feed movement of the movable feed element will always remain uniform, as determined by the positioning of the stops 21 22. It will likewise beobserved that the friction device, which is interposed between the movable feed element and the key-levers,

enables the key-levers and the universal bar to receive a movement independent of the movable feed element. From an inspection of the drawings it will be observed that the friction-surface 15 has a contour which corresponds substantially to an are drawn around the pivotal center of the feed-dog carrier. It will likewise be observed that the frictionpin 11 moves in substantially the same arc. In this event the pressure between the friction-surfaces remains substantially the same at all times. It may be desirable to slightly change the relation of the parts, so that a slightly greater resistance will be afiorded to t-hemovement of the pin 11 on the surface 15 in the direction of the arrow in Fig. 2 than is the case in the return movement of the pin. This may be accomplished by slightly increasing the rise of the surface 15 as it approaches the body of the carrier 16, as is suggested in the drawings. This will produce more of a wedging action between the parts in their movement in the direction of the arrow in Fig. 2, and more friction will be afforded in the movement of the pin 11 on the surface 15 by reason of a gradually-increasing expansion of the spring 13.

In any of the circumstances mentioned I consider that the parts referred to move in substantially an are drawn around the pivotal center of the movable feed element or feeddog carrier.

What I claim as new, and desire to secure by Letters Patent, is

1. In a type-writing machine, the combination of a loosely-mounted feed element having a friction'surface thereon, type-carrier mechanism, a movable arm positively operated by the type-carrier-actuating mechanism, and a part pivoted on the movable arm, and having a portion thereof which is maintained in frictional contact with the frictionsurface of the feed element.

2. In a type-writing machine, the combination of a loosely-mounted feed element having a friction-surface thereon, type-carrieractuating mechanism, a movable arm positively operated by the type-carrier-actuatin g mechanism, a part-pivoted to the movable arm and havinga portion thereof which is in frictional contact with the friction surface of the feed element, and a spring operatively connected to the pivoted part for maintaining the two friction-surfaces in contact.

3. In a type-writing machine, the combination of a vibratory feed-dog carrier having a friction-surface thereon, a vibrating arm movable independently of said feed-dog carrier, a link loosely pivoted to said arm and having a portion thereof which bears upon the friction-surface of the dog-carrier, a spring which maintains the parts in such frictional contact .and key-levers which are operatively connectating spring-pressed friction device the movement of which is operatively connected to and controlled by the key-levers, means for moving said spring-pressed friction device in substantially the same are that the dog-carrier moves in and an adjustable stop to limit the movement of the dog-carrier, whereby the spring-pressed friction device may transmit movement to and receive a movement independent of the dog-carrier.

5. In a type-writing machine, the combination of a dog-rocker having a segmental friction-surface formed thereon, a key-actuated crank-arm, and a spring-pressed link pivoted to said crank-arm and carrying a friction device that bears upon the segmental frictionsnrface of the do -rocker at all times and transmits movement thereto.

6. In a type-writing machine, the combination of key-levers, a universal bar controlled by said key-levers, an arm 8 connected to and controlled by said universal bar, a link 9 pivoted to said arm and carrying a friction device or member, a feed-dog carrier, a friction device or member 15 formed on said dog-car rier,means for maintaining said friction members in cooperative relation at all times, and an adjustable stop 21 to limit the movement of the feed-dog carrier, whereby the dog-car'- rier has a predetermined extent of movement irrespective of the extent of movement of the arm 8.

7. In a type-writing machine, the combination of key-levers, a universal bar controlled by said key-levers, an arm. 8 connected to and controlled by said universal bar, a link 9 pivoted to said arm and carrying a friction de vice or member 11, a spring for said friction device, a feed-d0a carrier, a segmental friction device or member 15 formed on said dogcarrier and with which the friction device or member 11 cooperates, an adjustable stop 21 to limit the movement of the feed-dog carrier, whereby the dog-carrier has a predetermined extent of movement irrespective of the extent of movement of the arm 8, and an adjustable stop 22 to limit the movement of the arm 8 in one direction.

Signed in the borough of Manhattan, city of New York, in the county of New York and State of New York, this 29th day of July, A. D. 1901.

. LEE S. BURRIDGE. Witnesses:

CHARLES E. SMITH,

E. M. WELLS. 

